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onsemi 74ABT244CPC
- Part No.:
- 74ABT244CPC
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74ABT244CPC.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,879
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Product details
Overview
74ABT244CPC from Fairchild Semiconductor is an octal non-inverting buffer/line driver with dual 3-STATE outputs, designed for memory address driving, clock distribution, and bus-oriented transmitter/receiver applications. It operates from 4.5 V to 5.5 V, delivers 64 mA sink and 32 mA source output drive, and guarantees pin-to-pin skew ≤1.8 ns under 50 pF load.
For engineers reviewing the 74ABT244CPC datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed simultaneous switching performance, hot-insertion capability, high-impedance glitch-free power-up/down behavior, and compatibility with 50 pF and 250 pF AC loads.
Technical Context
The 74ABT244CPC implements two independent 4-bit groups (I0–I3/O0–O3 and I4–I7/O4–O7), each controlled by its own active-low output enable (OE1, OE2). Its ABT logic family ensures TTL-compatible input thresholds and enhanced noise immunity over standard TTL.
It supports full-rail output swing (VOL ≤ 0.55 V at 64 mA, VOH ≥ 2.0 V at −32 mA), meets JEDEC MS-001 PDIP mechanical standards, and provides latchup protection per JEDEC JESD78. Dynamic performance is specified for both single- and 8-output switching events across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5 V to +5.5 V - Ensures robust operation across industrial-grade 5 V rail tolerances. |
| Output Sink Current | 64 mA - Drives heavy capacitive or resistive bus loads without external buffering. |
| Output Source Current | 32 mA - Supports active pull-up in bidirectional bus configurations. |
| Propagation Delay (tPLH/tPHL) | 1.0–3.6 ns @ 50 pF - Enables >100 MHz toggle frequency in low-load systems. |
| Pin-to-Pin Skew (tOSLH/tOSHL) | ≤1.8 ns @ 50 pF - Guarantees tight timing alignment across all eight outputs. |
| Input Thresholds (VIH/VIL) | VIH = 2.0 V min, VIL = 0.8 V max - Fully compatible with TTL and CMOS logic families. |
| 3-STATE Enable/Disable Time | tPZH/tPLZ ≤ 6.0 ns - Minimizes bus contention during state transitions. |
Pinout & Package
74ABT244CPC uses a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001 compliant, 0.300" wide body, with 2.54 mm lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs controlling first and second 4-bit groups respectively. |
| 2–5, 13–16 | I0–I3, I4–I7 | Non-inverting data inputs; direct connection to address/data lines or clock sources. |
| 6–9, 17–20 | O0–O3, O4–O7 | 3-STATE buffered outputs; electrically isolated when OE is HIGH. |
| 10 | GND | Ground reference for all internal circuitry and output current return path. |
| 20 | VCC | +5 V supply pin; decoupling capacitor required within 1 cm for stable AC performance. |
Key Features
| Feature | Design Value |
|---|---|
| Nondestructive hot insertion | Enables live board replacement without damaging the device or system bus. |
| Glitch-free 3-STATE during power cycling | Prevents bus contention or signal corruption during power-up/down sequences. |
| Guaranteed simultaneous switching specs | Validated for up to eight outputs switching concurrently under 50 pF and 250 pF loads. |
| Output skew control | ≤1.8 ns pin-to-pin skew ensures deterministic timing in parallel data paths. |
| Latchup protection | Withstands >500 mA reverse current and 10 V overvoltage per JEDEC JESD78. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM in embedded control systems. IC Role / Device Role / Timing Role: Non-inverting octal buffer isolating controller outputs while boosting drive strength. Use Value: Eliminates need for discrete transistor arrays; maintains <3.6 ns propagation delay across all bits. |
Use Scenario: Distributing a master clock signal to multiple synchronous peripherals (e.g., ADC, DAC, UART) on a PCB. IC Role / Device Role / Timing Role: Low-skew line driver ensuring phase-aligned clock edges across destinations. Use Value: Achieves ≤1.8 ns inter-output skew, reducing setup/hold margin uncertainty in multi-peripheral timing. |
| Bus Transceiver Interface | Legacy Peripheral Expansion |
|
Use Scenario: Bidirectional data bus isolation between CPU and legacy ISA-style peripheral cards. IC Role / Device Role / Timing Role: 3-STATE-enabled transmitter/receiver managing direction-controlled data flow. Use Value: Disable time < enable time prevents bus contention during direction switching. |
Use Scenario: Adding parallel port or GPIO expansion to industrial PLC modules using 5 V logic rails. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for TTL-compatible control signals. Use Value: 64 mA sink capability drives LEDs, relays, or optocouplers directly without external drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | Same ABT logic family, identical AC/DC specs, but TI's N-suffix denotes PDIP package with different lead finish (matte Sn vs. Fairchild's Pb-free matte Sn). | No functional difference; validated for same memory/address driving use cases. | Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation. |
| 74F244N | F-family variant: higher ICC (30 mA max vs. 50 µA), slower tPLH/tPHL (3.5 ns typ), no guaranteed skew or simultaneous switching specs. | Suitable only for non-critical timing applications where skew and noise immunity are not design constraints. | Choose only if cost sensitivity outweighs timing precision and EMI robustness requirements. |
Compared with SN74ABT244N and 74F244N, the 74ABT244CPC offers superior skew control, lower dynamic ICC, and guaranteed simultaneous switching-critical for high-speed bus integrity and noise-sensitive industrial designs.
Availability
74ABT244CPC is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, and industrial bus interface designs requiring stable component supply and long-term obsolescence management.
Supply support for 74ABT244CPC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Fairchild Semiconductor was a leading analog and mixed-signal IC manufacturer, acquired by ON Semiconductor in 2016; its ABT logic portfolio remains widely deployed in industrial and legacy computing systems.
The 74ABT244CPC belongs to Fairchild's Advanced BiCMOS Technology (ABT) logic family, engineered for high-speed, low-noise, 5 V bus interfacing with robust ESD and latchup protection.
FAQ
What is the maximum capacitive load supported by the 74ABT244CPC?
The 74ABT244CPC is fully characterized for both 50 pF and 250 pF loads. Propagation delay increases to ≤8.5 ns at 250 pF with 8 outputs switching, and it maintains guaranteed skew and simultaneous switching performance under these conditions. This makes the 74ABT244CPC suitable for driving longer traces or multiple downstream inputs without signal degradation.
Does the 74ABT244CPC support hot insertion?
Yes, the 74ABT244CPC features nondestructive hot insertion capability, verified per manufacturer specifications. Its 3-STATE outputs remain high-impedance during power sequencing, and internal protection circuits prevent latchup or damage when inserted into a live backplane or motherboard slot-making it ideal for field-replaceable modules using the 74ABT244CPC.
What is the purpose of separate OE1 and OE2 inputs on the 74ABT244CPC?
OE1 and OE2 independently control the 3-STATE outputs of two 4-bit groups (O0–O3 and O4–O7). This allows partial bus gating-for example, enabling only upper address bits while holding lower bits in high-Z-reducing system-level contention and enabling flexible memory-mapped I/O partitioning in designs using the 74ABT244CPC.
Is the 74ABT244CPC RoHS compliant?
Yes, the 74ABT244CPC is manufactured with lead-free terminations (matte tin plating) and complies with RoHS Directive 2011/65/EU. Its PDIP package (N20A) contains no intentionally added lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE, meeting environmental compliance requirements for industrial and commercial equipment using the 74ABT244CPC.
How does the 74ABT244CPC handle power-up and power-down transitions?
The 74ABT244CPC guarantees high-impedance glitch-free bus loading throughout the entire power-up and power-down cycle. Internal circuitry holds outputs in 3-STATE until VCC stabilizes above ~3.0 V and remains in high-Z until VCC drops below ~2.0 V-preventing spurious signals on shared buses during reset or brownout events in systems relying on the 74ABT244CPC.
74ABT244CPC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74ABT244CPC FAQ
1.How can I place an order for 74ABT244CPC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT244CPC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74ABT244CPC reliable?
The price and inventory of 74ABT244CPC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT244CPC is usually 5 days.
3.What payment methods are accepted for 74ABT244CPC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT244CPC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT244CPC?
74ABT244CPC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT244CPC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74ABT244CPC?
For technical support, including 74ABT244CPC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT244CPC requirements.
6.How does Aetrix verify that 74ABT244CPC is sourced from the original manufacturer or authorized distributors?
All 74ABT244CPC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74ABT244CPC meets industry standards.
7.What is the process for return or replacement of 74ABT244CPC?
All 74ABT244CPC units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT244CPC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74ABT244CPC part is unused and in its original packaging.
Return procedure for 74ABT244CPC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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